Cleaning the ar10 and the firing pin and firing pin retaining pin came out. The retaining pin has a tensioning split toward the end, but slides in and out easily. Should I 1 - try to slightly spread the tip or 2 - install and tap with punch to spread? Don't have a spare laying around and have hogs to kill. Not asking for a friend. Thanks!

It is a pin, not a carter key.

Does it fall out easily or does it require a little push?

I would not bend it to much, just enough to maintain tension

I tried those retainer pins with a split at the end they never did stay tight always just fell out when the carrier was taken out went back to the cotter pin style

It fell out very easily. I was worried that bending it might break it, so I wound up putting a pocket knife blade in the split and gently tapped with a bp hammer. Spread it out enough to create a holding pressure. Shot 2 hogs after that, so good for now. Will be checking it frequently. Thanks

Order a few of these

That's the plan. Thanks